• Document [2]
  • SIM800HSIM800L_Hardware Design_V2.02 29 2015-07-27 Smart Machine Smart Decision
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    SIM800L

    Min 
    Typ 
    Max 
    Unit 
    V
    IL
    -0.3 
    - 
    0.7 
    V 
    V
    IH
    2.1 
    - 
    3.1
    V 
    V
    OL
    - 
    - 
    0.4 
    V 
    V
    OH
    2.4 
    2.8 
    - 
    V 
    SIM800H&SIM800L module can support dual serial port function, that need execute AT command 
    "AT+CMNRP=1"first. Dual serial port including one full modem serial port and one three-wire serial port, pin 
    definition is different with standard definition of the Figure 2: Pin assignment (Top view) and Table 5: Pin 
    description. For more details please refer to Document [2].
     
    Note: Only B05 and later version support dual serial port function. 
    4.5.1 Function of Serial Port 
    Serial port: 
    z Full mode device. 
    z Contains data lines TXD and RXD, hardware flow control lines RTS and CTS, status lines DTR, DCD and 
    RI. 
    z Serial port can be used for CSD FAX, GPRS service and AT communication. It can also be used for 
    multiplexing function. For details about multiplexing function, please refer to table 11. 
    z Serial port supports the following baud rates: 
    1200, 2400, 4800, 9600, 19200, 38400, 57600,115200,230400 and 460800bps 
    z Autobauding only supports the following baud rates: 
    SIM800H&SIM800L_Hardware Design_V2.02 29 2015-07-27 

    Smart Machine Smart Decision 
    1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200bps 
    z The default setting is autobauding. 
    Autobauding allows SIM800H&SIM800L to automatically detect the baud rate of the host device. Pay more 
    attention to the following requirements: 
    z Synchronization between DTE and DCE: 
    When DCE powers on with autobauding enabled, it is recommended to send "AT" or "at" or "aT" or "At" 
    to synchronize the baud rate, until DTE receives the "OK" response, which means DTE and DCE are 
    correctly synchronized. For more information please refer to AT command "AT+IPR". 
    z Restrictions of autobauding operation: 
    The DTE serial port must be set at 8 data bits, no parity and 1 stop bit. 
    The URC such as "RDY", "+CFUN: 1" and "+CPIN: READY” will not be reported. 

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